CN110661502A - Volume adjusting method based on embedded system - Google Patents
Volume adjusting method based on embedded system Download PDFInfo
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- CN110661502A CN110661502A CN201910995976.XA CN201910995976A CN110661502A CN 110661502 A CN110661502 A CN 110661502A CN 201910995976 A CN201910995976 A CN 201910995976A CN 110661502 A CN110661502 A CN 110661502A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
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Abstract
The invention discloses a volume adjusting method based on an embedded system, which comprises the following steps: decoding an audio file, and acquiring a digital signal of the audio file as an initial digital signal; obtaining a scaling coefficient of volume adjustment; zooming the initial digital signal according to the zooming coefficient to obtain a second digital signal; correcting the second digital signal to obtain a third digital signal; inputting the third digital signal into a codec. The invention can realize the volume adjusting function only through the coder-decoder, thereby not only ensuring the user experience, but also reducing the cost and having obvious economic benefit.
Description
Technical Field
The invention relates to the field of audio module digital signal processing, in particular to a volume adjusting method based on an embedded system.
Background
With the development of the internet of things becoming faster and faster, various internet of things devices emerge endlessly. The market has very many voice broadcast products, and competition is very violent, and how to promote the performance, can also reduce cost, then becomes the key of preempting the market.
In the voice broadcast product in the prior art, to implement audio Signal Processing, a CODEC (Coder-Decoder) is generally adopted to convert an Analog Signal (Analog) that can be heard by human ears into a Digital Signal (Digital) that can be processed by a computer, and convert the processed Digital Signal into an Analog Signal that can be heard by human ears, thereby implementing audio Signal Processing.
Disclosure of Invention
According to the embodiment of the invention, the volume adjusting method based on the embedded system comprises the following steps:
decoding an audio file, and acquiring a digital signal of the audio file as an initial digital signal;
obtaining a scaling coefficient of volume adjustment;
zooming the initial digital signal according to the zooming coefficient to obtain a second digital signal;
correcting the second digital signal to obtain a third digital signal;
inputting the third digital signal into a codec.
Further, the preset value range of the digital signal received by the codec is-32768 ~ 32767.
Further, the scaling factors include, but are not limited to: 0.2, 0.4, 0.8, 1.0, 1.4, 1.8, 2.0.
Further, the modifying the second digital signal to obtain a third digital signal further includes the following sub-steps:
judging whether the maximum value or the minimum value of the second digital signal overflows a preset numerical range of the digital signal received by the coder-decoder;
if the second digital signal does not overflow the preset numerical range of the digital signal received by the coder-decoder, the second digital signal is a third digital signal;
and if the maximum value or the minimum value of the second digital signal overflows the preset numerical range of the digital signal received by the coder-decoder, setting the maximum value or the minimum value of the second digital signal as the maximum value or the minimum value of the preset numerical range of the digital signal received by the coder-decoder, and acquiring a third digital signal.
Further, the value range of the second digital signal is the same as the preset value range of the digital signal received by the codec.
Further, the value range of the second digital signal is-32768 ~ 32767.
Further, the value range of the initial digital signal is 1/2 of the preset value range of the digital signal received by the codec.
Further, the initial digital signal has a value in the range of-16384 ~ 16383.
According to the volume adjusting method based on the embedded system, the volume adjusting function can be realized only through the coder-decoder, so that the user experience is guaranteed, the cost is reduced, and the economic benefit is remarkable.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.
Drawings
FIG. 1 is a flow chart of a volume adjustment method based on an embedded system according to an embodiment of the present invention;
fig. 2 is a flow chart illustrating sub-steps of processing the second digital signal to obtain a third digital signal according to fig. 1.
Detailed Description
The present invention will be further explained by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings.
First, a volume adjustment method based on an embedded system according to an embodiment of the present invention will be described with reference to fig. 1 ~ 2, and a voice broadcast product for an embedded system has a wide application range.
As shown in fig. 1, the volume adjusting method based on the embedded system according to the embodiment of the present invention includes the following steps:
specifically, as shown in fig. 1, in S1, the audio file is read and decoded to obtain the digital signal of the audio file, and the decoded digital signal is taken as the initial digital signal. Therefore, the decoding of the Digital signals of the audio files is directly finished by configuring the audio decoder on a software layer without depending on a hardware Digital Signal Processing (DSP) chip, so that the cost is greatly reduced, and the competitiveness of the product is enhanced.
Further, in this embodiment, the maximum value range of the digital signal is-32768 ~ 32767, that is, the preset value range of the digital signal received by the codec is-32768 ~ 32767, and the value range can be adjusted according to the performance of the embedded system.
Specifically, as shown in fig. 1, in S2, a scaling factor of the volume adjustment is acquired; in this embodiment, 7 volume levels are adopted, that is, scaling coefficients are 0.2, 0.4, 0.8, 1.0, 1.4, 1.8, and 2.0, and 7 types in total, so that the volume level can be flexibly set according to requirements in actual use, and the volume level is large in adjustment range and flexible in adjustment.
Further, since the maximum volume level is twice as large, when the numerical range of the digital signal of the selected audio file is within 1/2 of the maximum numerical range of the digital signal, then the amplification by 2 times does not exceed the representation range, the audio is not distorted, and when the amplification by 2 times is reduced, only the data not divisible by 2 has a deviation which is small relative to the data itself, that is, in the present embodiment, the numerical range of the digital signal of the preferred audio file, i.e., the initial digital signal, is selected to be-16384 ~ 16383, and the selection of such an audio file can satisfy both the sufficient condition of small distortion and the necessary condition for the implementation of the algorithm.
Further, for the embedded system using external audio, since the maximum and minimum values of audio data are basically concentrated in 1/2 of the maximum numerical range of the digital signal, the distortion can be ensured to be small by performing the volume adjustment with small amplitude.
Specifically, as shown in fig. 1, in S3, the initial digital signal is scaled according to the scaling factor to obtain the second digital signal, and the audio source digital signal is directly obtained and scaled up and down to simulate a DSP for signal processing, so that the amplitude of the audio signal is directly changed without hardware, thereby implementing dynamic control of the volume.
Specifically, as shown in fig. 1 and 2, in S4, the second digital signal is modified to obtain a third digital signal.
Specifically, as shown in fig. 2, in S41, it is determined whether the maximum or minimum value of the second digital signal exceeds a preset value range of the digital signal received by the codec, i.e., the maximum value range of the digital signal.
Specifically, as shown in fig. 2, in S42, if the second digital signal does not overflow the preset value range of the digital signal received by the codec, the second digital signal input to the codec is the third digital signal, the value range of the second digital signal that does not overflow is the same as the maximum value range of the digital signal, i.e., in this embodiment, the value range of the second digital signal is-32768 ~ 32767.
Specifically, as shown in fig. 2, in S43, if the maximum or minimum value of the second digital signal exceeds the preset value range of the digital signal received by the codec, the maximum or minimum value of the second digital signal is set as the maximum or minimum value of the preset value range of the digital signal received by the codec, and a third digital signal is obtained.
Specifically, as shown in fig. 1, in S5, the third digital signal is input to the codec, converted by the codec, and played through the power amplifier and the speaker, which does not need to pass through DSP hardware any more, thereby saving cost, achieving volume adjustment, and improving user experience.
In the above, with reference to fig. 1 ~ 2, the volume adjustment method based on the embedded system according to the embodiment of the present invention is described, and the volume adjustment function can be realized only by the codec, so that the user experience is ensured, the cost is reduced, and the economic benefit is significant.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an embedded system-based volume adjustment method" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. A volume adjusting method based on an embedded system is characterized by comprising the following steps:
decoding an audio file, and acquiring a digital signal of the audio file as an initial digital signal;
obtaining a scaling coefficient of volume adjustment;
zooming the initial digital signal according to the zooming coefficient to obtain a second digital signal;
correcting the second digital signal to obtain a third digital signal;
inputting the third digital signal into a codec.
2. The embedded system-based volume adjusting method of claim 1, wherein the codec receives the digital signal with a preset value range of-32768 ~ 32767.
3. The embedded system based volume adjusting method of claim 1, wherein the scaling factor includes but is not limited to: 0.2, 0.4, 0.8, 1.0, 1.4, 1.8, 2.0.
4. The method for adjusting the volume based on the embedded system according to claim 1 or 2, wherein the modifying the second digital signal to obtain the third digital signal further comprises the sub-steps of:
judging whether the maximum value or the minimum value of the second digital signal overflows a preset numerical range of the digital signal received by the coder-decoder;
if the second digital signal does not overflow the preset numerical range of the digital signal received by the coder-decoder, the second digital signal is a third digital signal;
and if the maximum value or the minimum value of the second digital signal overflows the preset numerical range of the digital signal received by the coder-decoder, setting the maximum value or the minimum value of the second digital signal as the maximum value or the minimum value of the preset numerical range of the digital signal received by the coder-decoder, and acquiring a third digital signal.
5. The embedded system-based volume adjustment method of claim 4, wherein the range of values of the second digital signal is the same as the preset range of values of the digital signal received by the codec.
6. The embedded system-based volume adjustment method of claim 5, wherein the second digital signal has a value ranging from-32768 ~ 32767.
7. The embedded system-based volume adjustment method of claim 1, 2 or 3, wherein the initial digital signal has a value range of 1/2 of the preset value range of the digital signal received by the codec.
8. The embedded system-based volume adjustment method of claim 7, wherein the initial digital signal has a value ranging from-16384 ~ 16383.
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Cited By (1)
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| CN111580135A (en) * | 2020-05-27 | 2020-08-25 | 上海锐伟电子科技有限公司 | Method and structure for reducing GPS drift |
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